This also pulls in a new version of the mediawiki code sniffer and also
the base code sniffer.

This path touches a lot of files.
These are ALL auto fixes, with the exception of the following fixed
files:
 - ItemContent.php
 - EntitySourceDefinitionsLegacyClientSettingsParser.php

Two new build scripts and two new composer commands have also been
introduced in this change to make using code sniffer and fixer slightly
easier for all.
These are:
 - composer phpcs-modified
 - composer fix-modified

These commands both use `git ls-files -om --exclude-standard` to list
files that modified and or "other (untracked) to run with phpcs or
phpcbf in order to save time pre commit.

Change-Id: I054e395769b90db1a24225885c578f15288890ce